I totally agree, that address may be used to prove ownership in signing private messages, but no one will use it in serious projects, so you will not get much money.
Longest list:
1
BoyishnessfwHq3wSkCkJ7iafUdjhghfU
1
GEnesisReVCQG641yERVQgStUvqH6S9U2
1QBDLYTDFHHZAABYSKGKPWKLSXZWCCJQBX
If you are interested in "buying" a vanity address, I would suggest going to this
thread. The process described in the referenced thread will result in the person creating the vanity address having no way to know your private key.
He will make some profits, but he can take advantage of some of the computer capabilities he has in mining, and he will make a better profit.